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Measurement of the top-quark pole mass in dileptonic tt¯ + 1-jet events at s=13 TeV with the ATLAS experiment
Journal article   Open access   Peer reviewed

Measurement of the top-quark pole mass in dileptonic tt¯ + 1-jet events at s=13 TeV with the ATLAS experiment

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
The journal of high energy physics, Vol.2025(12), p.23
2025
Handle:
https://hdl.handle.net/20.500.12741/rep:14339

Abstract

Classical and Quantum Gravitation Elementary Particles Physics and Astronomy Quantum Field Theories Regular Article - Experimental Physics Relativity Theory Physics Quantum Field Theory Quantum Physics String Theory
A measurement of the top-quark pole mass mpolet is presented in tt¯ events with an additional jet, tt¯+1-jet, produced in pp collisions at s√=13 TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of 140 fb−1. Events with one electron and one muon of opposite electric charge in the final state are selected to measure the tt¯+1-jet differential cross-section as a function of the inverse of the invariant mass of the tt¯+1-jet system. Iterative Bayesian Unfolding is used to correct the data to enable comparison with fixed-order calculations at next-to-leading-order accuracy in the strong coupling. The process pp→tt¯j (2→3), where top quarks are taken as stable particles, and the process pp→bb¯l+νl−ν¯j (2→7), which includes top-quark decays to the dilepton final state and off-shell effects, are considered. The top-quark mass is extracted using a χ2 fit of the unfolded normalized differential cross-section distribution. The results obtained with the 2→3 and 2→7 calculations are compatible within theoretical uncertainties, providing an important consistency check. The more precise determination is obtained for the 2→3 measurement: mpolet=170.7±0.3 (stat.)±1.4 (syst.) ±0.3 (scale) ±0.2 (PDF⊕αS) GeV, which is in good agreement with other top-quark mass results.
url
https://doi.org/10.1007/JHEP12(2025)023View
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